Nepenthes ramos

Nepenthes ramos


Nepenthes ramos Jebb & Cheek in Willdenowia 43(1): 108 (-112, fig. 1). 2013 sec. Cheek & Jebb 2013 wfo-0001302621


    Terrestrial climber , height unknown; stems terete, 6–8 mm in diam.; internodes 22–60 mm long; axillary buds spike-like, 3–5 mm long, inserted 4–8 mm above axil, indumentum persistent (to at least 5th internode from stem apex), of bright white hairs covering surface, of two types: simple erect curled hairs 0.5–1 mm long, and stellate 3–6-armed appressed hairs 0.25–0.5 mm in diam. Leaves spirally inserted, coria - ceous; leaf blade narrowly elliptic-oblong or narrowly oblong, 13.5–22 × 3.0–3.7 cm, base obtuse-acute, decur - rent into petiole, apex acute; longitudinal nerves 2 pairs, within 6–7 mm from margin, moderately conspicuous; pennate nerves inconspicuous to obscure; upper sur - face glossy, soon glabrous; lower surface drying brown, c. 40 % covered with white hairs of two types, as stem: simple patent hairs 1–1.5 mm long, c. 1 per mm², and stellate hairs 0.25–0.5 mm in diam., 3–5 per mm²; sessile glands drying black, c. 0.1 mm in diam., 5–8 per mm²; midrib densely pubescent. Petiole winged-canaliculate, (3.8–)4.5–10 × 0.3–0.4(–0.5) cm; wings erect proxi - mal to stem but patent in distal part towards leaf blade, clasping stem for c. ½ its circumference, decurrent as a low ridge for 0.5–1 cm. Lower and intermediate pitchers unknown. Upper pitchers (tendrils coiled) subcylindric, (12.5–)14–20 × 3.8–4.5 cm, ± equally wide at base and apex, gradually constricting midway to 2.8–3.3 cm wide; outer surface sparsely and inconspicuously c. 10 % cov - ered with dull red-black hairs of two types: curved simple hairs 1–1.5 mm long, 0–3 per mm², and shortly stipitate 3–6-armed bushy stellate hairs 0.05–0.15 mm in diam., c. 10 per mm²; fringed wings absent, reduced to ridges running length of pitcher; mouth ovate, oblique, 4–5.2 × 3.2–5 cm; peri stome cylindric-flattened, c. 3 mm wide at front, c. 5 mm wide at sides, c. 3.5 ridges per mm, ridges c. 0.1 mm high, inner edge without conspicuous teeth at margin but with holes visible at column, outer edge not lobed; column short, not strongly developed; lid ovate, 4.3–5.1 × 4.1–4.7(–5) cm, base cordate, sinus c. 5 mm deep, apex rounded; lower surface of lid with basal ap - pendage well-developed, slightly hooked, 2–3 × 2–3 mm, situated about middle of a ridge 7–10 mm long and 1–2 mm high; nectar glands strongly dimorphic, mostly absent from midline, except distal part with a cluster of 15–25 large longitudinally elliptic raised perithecoid glands 1.25–1.6 × 0.7–0.8 mm, central lacunae c. 0.5 × 0.25 mm, about same number of these nectar glands also scattered thinly throughout distal half of lid, among dense smaller circular volcano-like nectar glands which cover 30–40 % of lower lid surface, these 0.3–0.6 mm in diam., 1–3 per mm²; upper surface of lid with same in - dumentum as outer pitcher; spur inserted c. 5 mm below junction of lid and pitcher, unbranched, cylindric, 9–13 × c. 1 mm, surface with dense white appressed simple and stellate hairs, apex rounded. Male inflorescence with peduncle 32.5–36 cm long, 4–5 mm diam. at base, indu - mentum as stem; rachis 39–40 cm long, bearing c. 320 partial peduncles evenly scattered along its length; par - tial peduncles 0.1–4 mm long, 2-flowered from base to apex of inflorescence; bracts inserted midway along partial peduncle, patent, filamentous, 1–1.5 mm long; pedicels not strongly divergent, 11–16 mm long; rachis to lower surface of tepals densely pubescent with white mainly appressed simple hairs c. 0.5 mm long together with stellate hairs covering 60–80 % of surface. Tepals 4, elliptic, c. 4 × 3 mm, apex obtuse; lower surface com - pletely covered with translucent pale brown papillae mixed with bright white simple hairs c. 0.2 mm long (covering c. 20 % of surface); upper surface with 6–10 elliptic nectar glands, drying black, glabrous apart from hairs at base. Androphore 4–5 mm long, glabrous, but base surrounded by dense patent red-brown hairs. An ¬ ther head white, ovoid, c. 2 × 1.5 mm. Female inflores - cence as male but pe duncle (18–)24–36 cm long; rachis 7–19 cm long, bearing 20–50 partial peduncles; partial peduncles 5–10 mm long; pedicels 8–9 mm long; tepals c. 4 × 1.5 mm, enlarging in fruit; ovary sessile, ovoid, c. 4 × 2 mm, densely white and brown hairy; stigmas 4. Infructescences (slightly immature) as female inflores - cences. Fruit valves 4, narrowly oblong, c. 18 × 4 mm, outer surface moderately densely appressed silky bronze hairy. Seeds pale brown, filamentous, c. 9 mm long; seed body central, c. 2 × 0.5 mm.A


    A species belonging to the Nepenthes ramos Group.A

    Distribution (General)

    Philippines, Mindanao, Surigao ProvinceA


    A. Cheek, M. R. & Jebb, M. H. P. 2013: Nepenthes ramos (Nepenthaceae), a new species from Mindanao, Philippines. – Willdenowia 43(1): 107-111